Revolving sifting-screen.



1 E. E. HANNA. REVOLVING SIFTING SCREEN.

APPLICATION FILED JUNE 1, 1908.

Patented July 27, 1909.

R SHEETS-SHEET 1.

E. E. HANNA.

REVOLVING SIFTING SCREEN.

APPLICATION FILED JUNE 1, 1908.

Patented July 27, 1909.

2 SHEETS-SHEET 2.

rave/afar zawjff arm 2 UNITED s ATEs PATENT OF IOE.

ELMER E. HANNA, OF CHICAGO, ILLINOIs, ASSIGNOR TO HANNA ENGINEERING WORKS. A

' CORPORATION OF ILLINOIS. 4

REVOLVING SITTING-SCREEN.

Specification of Letters Patent.

Patented July 27, 1909.

I Application filed June 1, 1908. Serial No. 436,017.

To all whom it may concern:

Be it known that I, ELMER E. HANNA, a citizen of the United States, residing at Chicago,in the county of-Cook and State of Illinois, have invented certain new and useful Improvements in Revolving sifting-Screens,

ventionwill be made apparent in the follow ing specification and claims, taken in connection with the accompanying drawings in which Figure 1 is a side elevation partly in sect1on showing my device in normal operating posit on. Fig. 2 is a corresponding view show ng the device in dumping position. Fig. 3 is asection taken on the line 3 of Fig. 1 showing a detail of construction. Fig. 4 is a top plan view partly in section, and Fig. 5 Is an end elevation, the direction of view being at right angles to that of Fig. 1.

From the base 15 the standards 16 rise terminating at their upper ends in journal boxes 17. The base 15 and the standard 16 constitute a supporting frame. Another 20 and 21"at the ends of these arms, and

' these shafts are respectively j ournaled in the bearings 17. The frame 18 is a tilting frame rotatably mounted in the supporting frame 15-16. In the center of the frame 18 is a journal bearing 23 which carries a rotatable shaft 22 on which the gear Wheel 24 is fixed. An electric motor 25 is mounted on the frame 18, its rotor shaft carrying a gear pinion 26. The bracket 28 mounted on the frame 18 on one side of the motor 25 constitutes a journal bearing for a shaft 29 which carries the gear wheel 30 and the gear pinion 31. Thus the rotations of the rotor of the motor 25 are twice reduced through the gear train 2630-3 1-24 and thus communicated to rotate the shaft 22. The conductors for conveying electric current to drive the motor 25 are indicated by the reference numeral 32. The shaft 22 has attached to it a head 33 supported by radial ribs 34 and fastened in lace by the key 35. Opposed to the circu ar head 33 is a frusto-conical shell 36, the two members being fixed relatively to each other by the rods 37 which have their ends somewhat reduced in size and passing through lugs 38 and secured 1) nuts. Between the head 33 and the shel 36 is the perforated screen 39 having the shape of a circular cylindrical surface.

I As a part of one of the standards 16 there is a sector shapedig'uide 40 around the adjacent bearing 17. This has a track 41 ter minated at the ends by shallow depressions 42 and 43. The block 44 is'fastened to the shaft 21 by means-of the key 45. A yoke 46 embraces the block 44 and has.a pivotal engagement therewith by means of the pin 48 through the lugs 47 on the block 44. I

The yoke46 terminates in a handle 49. The

block 44 has a cylindrical chamber or slot 51.

in which a bolt or plunger 50 is located. The end 54 of this )lunger 50 has atransverse hole 52 through which the bolt 53 carried by the yoke 46 extends.

In normal operation the device will appear as in Fig. 1, the current supplied to the electric motor 25 through the conductors 32' r0-' tating the sifting drum 333936 by means of the reducing gearing. A workman can shovel the material. to be sifted in through the opening in the shell 36 and the finer particles will pass through the screen 39' and fall down upon the ground or into a vessel placed beneath, as for example, a

the screen drum of the residue of coarser particles the operator seizes the handle 49 and pulls it out horizontallyso as to disengage the bolt 50 from the depression 43. Then by means of the same handle 49 he rotates the drum upwardly and around through an arc of about 225 degrees to the position shown in Fig. 2. This being done with a fair degree of quickness the coarse residue which at the commencement of the movement lay on the lower side of the sifting drum will be carried upwardly and over and thrown out when the drum reaches the position shown in Fig. 2. All the time the electric motor 25 may continue to rotate the drum or if desired the current can be shut off shoveled in at the open end. It will be wheel-barrow. When it is desired to empty tending to the supply of material.

noticed that the device drops the fine ma teriaLon one side of the frame 16 and that it dischar es the coarse residue on the opposite side of t is frame. The entire ap aratus can be readily moved toany place w ere its use may be desired. It can-be started at any time by'merely turning the current into the electric motor 25. It 15 arranged to receive I material to be sifted in a convenient way,-'to

deliver the fine material which passes through the screen so that it can be con- .ing frame, a tilting frame rotatably mounted on the supporting frame, a sifting drum rotatably mounted on the tilting frame, the drum being at one side of the tilting frame and the axis ofthe drum being at a right angle to the tilting axis, arid co-acting stops onthe supporting frame and the tilting frame, sai

frame with the axis of the drum horizontalv stops being adapted to hold the in one position or with the axis inclined downward in another position, said two positlons being on opposite sides of the supporting frame.

2. A sifting screen comprising a supporting frame, a'tiltin'g frame rotatably mounted on said supporting frame, a sifting drum mounted to rotate on said tilting frame, coacting stops on the two frames adapted to support the drum with its axis horizontal, and other co-acting stops adapted to hold the drum with its axis lnclined downward,

the range of movement of the drum between said stops being more than 180 degrees.

3. ,A siftmg screen'comprising a fixed support, a frame journaled in said support; a

rotatable sifting drum carriedby sai frame, a handle pivoted to the frame, a stud atta'ched to said handle,gand' a guide -attached to ,the fixed support alongside said stud, said guide-having recesses at its ends to engage the studand thereby lock the frame in either of two different positions.

4. A sifting screen comprising a fixed suport, a tilting frame rotatably mounted on a orizontal axis on said support, a bylindrical sifting drum mounted rotatably on the-tilting frame on an axis at a right angle to the tilting axis, said drum projecting to one side of the tilting frame, a pair of stops on the support and tilting frame adapted tolprevent' rotation of the frame in a direction to throw the axis of the drum below a horizontal line on one-side of the supporting 'frame, and a pair of stops adapted to prevent rotation of the tilting frame beyond a osition with the axis'of the drum downwar y inclined on the opposite side of the sipporting frame, said t1 ting frame and the rum carried thereby being rotatable upwardly between the two limiting positions thereof.

5. A sifting screencomprising a supporting frame, a tiltingframe rotatably mounted on said supporting frame, a sifting drum mounted to rotate on said tilting frame,.a motor also mounted on said tilting frame and connected 'to drive said drum, coacting.

stops on the two frames adapted to support the drum with its axis horizontal, and other coacting stops adapted to hold the drum with its axis inclined downward, the range of movementof the drum between said stops being more than 180 degrees.

6. A sifting screen comprising a supporting frame, a tilting frame rotatably mounted on said supporting frame, a sifting drum mounted to rotate on said tilting frame, a motor also mounted on said tilting frame, reducing gearing connecting the motor to the drum, coacting stops on the two frames adapted to su port the drum with its axis horizontal, an other coacting stops adapted to hold the drum with its axis inclined downward, the range of movement of the drum between said stops being more than 180 degrees.

7. A sifting screen comprising two supporting standards, a U-shaped tilting frame with its ends pivotally. connected to said "standards, a shaft mounted axially in said U-shaped frame, a sifting drum mounted on said s aft between the arms of said tilting frame, coacting stops on the two frames adapted to su port the drum with its axis horizontal, an other coacting stops adapted to hold the drum with its axis inclined downward, the range of movement of the drum between said stops being more than degrees. e

8. A sifting screen comprising a supporting frame, a tilting frame rotatably mounted on said "supporting frame, a shaft mounted to'rotate on said tiltingframe, a circular head attached to the end of said shaft, a cylindrical perforated wall adjacent to said head, a conical inwardly directed shell at the other end of the cylindrical wall, bolts clamping said wall between said head and shell, coact ing stops on the two frames adapted to support the drum with'its axis horizontal, and

other coacting stops adapted to hold the drum with itsaxis inclined downward, the

range of movement of the drum between said sto 5 being more than 180- degrees.

n testimony whereof, I have subscribed my name. ELMER E. HANNA.

Witnesses:

PHILETUS W. GATES, THOMAS F. SHERIDAN. 

